Sometimes, we want to test for a rejected promise using Jest.

In this article, we’ll look at how to test for a rejected promise using Jest.

How to test for a rejected promise using Jest?

To test for a rejected promise using Jest, we can use the rejects.toEqual method.

For instance, we write

it('rejects...', () => {
  const Container = createUserContainer(CreateUser);
  const wrapper = shallow(<Container />);
  expect(wrapper.instance().handleFormSubmit()).rejects.toEqual('error');
});

to call rejects.toEqual with the promise rejection message we want to check for.

It assumes that handleFormSubmit returns a promise.

Conclusion

To test for a rejected promise using Jest, we can use the rejects.toEqual method.